import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'
import Welcome from './components/Welcome.vue'
import Users from './components/user/Users.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/login', component: Login },
  { path: '/', redirect: '/login' },
  { path: '/home',
    component: Home, 
    redirect: '/welcome',
    children: [
    { path: '/welcome', component: Welcome},
    { path: '/users', component:Users}
  ] }
]

const router = new VueRouter({
  routes
})

//挂载路由导航守卫
router.beforeEach((to, from, next) => {
  //to——将要访问的路径
  //from——代表从哪个路径跳转而来
  //next——是一个函数表示放行
  //    next() 放行；next('/login') 强制跳转

  if (to.path === '/login') return next();
  //获取token
  const tokenStr = window.sessionStorage.getItem('token');
  if (!tokenStr) return next('/login');
  next();
})

export default router
